<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }

        ul > li{
            text-align: center;
            margin-bottom: 20px;
        }
        ul >li > a >img{
            width: 250px;
            height: 200px;
        }
        ul >li > a:hover{
            opacity: 0.8;
        }
        .div1{
            width: 30px;
            height: 20px;
            background-color: #BFC5B9;
            border-radius: 20px;
            text-align: center;
            float: left;
            margin-top: 90px;
            display: none;
        }
        #div2:hover{
            opacity: 0.7;
        }
        #div2:hover .div1{
            display: block;
        }
        #div2 .div1:hover
        {
            background-color: chartreuse;
        }
        #div2{
            width: 200px;
            height: 200px;
            background-color: cadetblue;
        }

        #div3{
            float: right;
        }
    </style>
</head>
<body>
    <ul>
        <li><a><img src="a6fbeae63ec0d46c.jpg.webp"/></a></li>
        <li><a><img src="beab09dd3580d957.jpg.webp"></a></li>
        <li><a><img src="fdff58457adbef3e.jpg.webp"></a></li>
    </ul>

    <div id="div2">
        <div class="div1">&lt;</div>
        <div class="div1" id="div3">&gt;</div>
    </div>

</body>
</html>